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Development of a muon linac toward the precise measurement of the muon anomalous magnetic moment (J-PARC E34)

Otani, Masashi*; Ito, Takashi  ; Iwashita, Yoshihisa*; Iwata, Yoshiyuki*; Kawamura, Naritoshi*; Kitamura, Ryo*; Kondo, Yasuhiro   ; Saito, Naohito; Naito, Fujio*; Hasegawa, Kazuo; Hayashizaki, Noriyosu*; Mibe, Tsutomu*; Morishita, Takatoshi  ; Yoshida, Mitsuhiro*

We are developing a muon linac, which will be first case in the world, for the muon anomalous magnetic moment measurement at J-PARC. In the experiment, an ultra-cold muon beam is generated from a surface muon beam by a thermal muonium production followed by the laser dissociation and accelerated to 300 MeV/c by the linac. The muon linac consists of an RFQ, an inter-digital H-mode (IH) drift tube linac (DTL), a Disk And Washer (DAW) structure, and a disk loaded structure. The ultra-cold muons will have an extremely small momentum spread of about 0.1% with a normalized transverse emittance of around 1.5 $$pi$$ mm-mrad. In order to satisfy experimental requirement of extremely small transverse divergence angle, the muon should be accelerated without substantial emittance growth. The RFQ was already commissioned at J-PARC with nominal operation power. The beam dynamics and cavity design of IH-DTL and DAW has finished. In this talk, current status of the developments will be presented.

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